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The chart at http://www.northursalia.com/modifica...ng/wrxpin.html should help. It shows the meaning of the wires connected to the ECU, hidden behind a plate under the top of the carpeting on the passenger's side. It's easiest to tap the sensor signal there. It's for a 2002 but will work for your purposes on a 2003. You want to tap the rear oxygen sensor signal for your meter.

he forgot to mention splicing a 02 gauge into the stock system won't give you any usefull information. Sell that crap on Ebay and either get a real standalone Wide band system, or go cheap and get an EGT setup.

dude do not waste your money on a crap "air Fuel ratio gauge" it does absolutly nothing. Its just a light show and a "look at me Im straight up NOS yo" toy. Just buy a wideband and get a bunge welded into your downpipe. or buy the cobb/megan downpipe with the bung already in. You can get an AEM Wideband for $250.